Tired leg, knee pain, back pain, pain in groin area. Suggestion?

I was on holiday and we had some walking to do. We stayed in a hotel in Las Vegas that required a lot of walking just to get out the front door. My legs got tired, my knees hurt (I do have arthritis in them) and I got pain in my groin , right hip and aches in my back. When I stand up after sitting for 30 minutes I have to wait until my legs decide to hold me up and work. This is troubling, do you have suggestions?